TY - JOUR
T1 - Synergistic Effect of MoO2-Ni3(PO4)2 Heterostructures In Situ Grown on Nickel Foam Enhances the Efficiency of Hydrogen Evolution Reaction in Simulated Seawater
AU - Jin, Zhongxin
AU - Pang, Haijun
AU - Cai, Yaxin
AU - Yang, Mengle
AU - Xin, Jianjiao
AU - Ma, Huiyuan
AU - Wang, Xinming
AU - Yang, Guixin
AU - Sun, Wenlong
AU - Yu, Wing Yiu
N1 - Publisher Copyright:
© 2024 American Chemical Society.
PY - 2024/10/19
Y1 - 2024/10/19
N2 - Hydrogen (H2) with a high gravimetric energy density (142 MJ/kg) and zero carbon emissions is a green energy source. The electrocatalytic hydrogen evolution reaction (HER) is a prominent strategy for hydrogen production, and the essential technology of electrocatalysts focuses on creating catalysts that are highly efficient, cost-effective, and excellently stable. Herein, a heterostructure electrode/catalyst consisting of MoO2-Ni3(PO4)2/NF (where NF = nickel foam) was fabricated using (NH4)6[NiMo9O32]·6H2O as precursor via a two-step method utilizing hydrothermal synthesis and chemical vapor deposition (CVD). Thanks to the remarkable synergistic effect occurring at the interfaces of the heterostructure, the catalytic efficiency of MoO2-Ni3(PO4)2/NF can outperform that of other catalyst materials. In particular, the MoO2-Ni3(PO4)2/NF electrode exhibits overpotentials of 66 and 258 mV at 10 mA cm-2, along with low Tafel slopes of 56.03 and 85.32 mV/dec in 1 mol/L KOH and simulated seawater electrolyte, respectively. Density functional theory calculations (DFT) validate that the Gibbs free energy (ΔGH*) values for hydrogen adsorption of MoO2 (110)/Ni3(PO4)2 (−222) with 0.033 eV are much closer to zero, similar to Pt/C. In situ FTIR spectra indicate that the synergistic effect of MoO2 (110)/Ni3(PO4)2 (−222) can further create more catalytic active sites and modulate intermediate H* adsorption to promote the HER process. Overall, this study highlights the potential of nanostructured MoO2-Ni3(PO4)2 heterostructures for application in efficient hydrogen production under seawater conditions.
AB - Hydrogen (H2) with a high gravimetric energy density (142 MJ/kg) and zero carbon emissions is a green energy source. The electrocatalytic hydrogen evolution reaction (HER) is a prominent strategy for hydrogen production, and the essential technology of electrocatalysts focuses on creating catalysts that are highly efficient, cost-effective, and excellently stable. Herein, a heterostructure electrode/catalyst consisting of MoO2-Ni3(PO4)2/NF (where NF = nickel foam) was fabricated using (NH4)6[NiMo9O32]·6H2O as precursor via a two-step method utilizing hydrothermal synthesis and chemical vapor deposition (CVD). Thanks to the remarkable synergistic effect occurring at the interfaces of the heterostructure, the catalytic efficiency of MoO2-Ni3(PO4)2/NF can outperform that of other catalyst materials. In particular, the MoO2-Ni3(PO4)2/NF electrode exhibits overpotentials of 66 and 258 mV at 10 mA cm-2, along with low Tafel slopes of 56.03 and 85.32 mV/dec in 1 mol/L KOH and simulated seawater electrolyte, respectively. Density functional theory calculations (DFT) validate that the Gibbs free energy (ΔGH*) values for hydrogen adsorption of MoO2 (110)/Ni3(PO4)2 (−222) with 0.033 eV are much closer to zero, similar to Pt/C. In situ FTIR spectra indicate that the synergistic effect of MoO2 (110)/Ni3(PO4)2 (−222) can further create more catalytic active sites and modulate intermediate H* adsorption to promote the HER process. Overall, this study highlights the potential of nanostructured MoO2-Ni3(PO4)2 heterostructures for application in efficient hydrogen production under seawater conditions.
UR - http://www.scopus.com/inward/record.url?scp=85208702542&partnerID=8YFLogxK
U2 - 10.1021/acs.cgd.4c01122
DO - 10.1021/acs.cgd.4c01122
M3 - Journal article
AN - SCOPUS:85208702542
SN - 1528-7483
VL - 24
SP - 9097
EP - 9109
JO - Crystal Growth and Design
JF - Crystal Growth and Design
IS - 21
ER -
